使用JAVA API在Solr中的实时索引

Question

Time T1 -> Create an index.
Time T2 -> Multiple users performing search using the index.
Time T2 -> Simultaneously in Time T2, New file needs to be added to index.

Solr（通过JAVA API）是否有办法在Real TIME中将新文件添加到索引中。

如果是，请告知，哪个JAVA API。

如果不是，我已经计划采用以下方法来处理上述情况。

Time T1 -> Create an index.
Time T2 -> when the new file arrives; create a copy of index object. To the new object; appending the index details for newly arrived file.

如果上述方法可行，请告知。